Ribbon seems to be an alt version of Penfan Girls and the link the Bubble System flyer is broken. The Crystal System page could use some updates. Cave 3rd is missing Akai Katana, Mushihime Sama Futari 1.0 and 1.5 and Dodonpachi Daifukkatsu Black Label. And there's no PGM2 page.
Also I get: Warning: getimagesize() [function.getimagesize]: Filename cannot be empty in /home2/system23/public_html/lib/lib.php on line 286